3091145728 has 88 divisors (see below), whose sum is σ = 6974210880. Its totient is φ = 1356472320.

The previous prime is 3091145713. The next prime is 3091145741. The reversal of 3091145728 is 8275411903.

It is a tau number, because it is divible by the number of its divisors (88).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321925 + ... + 331387.

Almost surely, 2^3091145728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3091145728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3487105440).

3091145728 is an abundant number, since it is smaller than the sum of its proper divisors (3883065152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3091145728 is a wasteful number, since it uses less digits than its factorization.

3091145728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9523 (or 9505 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 3091145728 is about 55598.0730601340. The cubic root of 3091145728 is about 1456.7101957353.

The spelling of 3091145728 in words is "three billion, ninety-one million, one hundred forty-five thousand, seven hundred twenty-eight".